[Bugs] [Bug 1262417] New: Data Tiering:Impossible to detach tier if hot tier has only one brick over a dist-rep cold tier volume

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1262417

            Bug ID: 1262417
           Summary: Data Tiering:Impossible to detach tier if hot tier has
                    only one brick  over a dist-rep cold tier volume
           Product: GlusterFS
           Version: 3.7.4
         Component: tiering
          Assignee: bugs at gluster.org
          Reporter: nchilaka at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:
========================
it is impossible to detach a tier on  a single hot brick in hot tier over a
dist-rep cold tier(non-empty)(see steps)
[root at zod glusterfs]# gluster  v detach-tier zx status
volume detach-tier status: failed: Detach-tiernot started
[root at zod glusterfs]# gluster  v detach-tier zx start
volume detach-tier start: failed: Bricks not from same subvol for distribute
[root at zod glusterfs]# gluster  v detach-tier zx start
volume detach-tier start: failed: Bricks not from same subvol for distribute
[root at zod glusterfs]# gluster  v detach-tier zx commit
volume detach-tier commit: failed: Bricks not from same subvol for distribute
[root at zod glusterfs]# gluster  v detach-tier zx commit force
volume detach-tier commit force: failed: Bricks not from same subvol for
distribute

Version-Release number of selected component (if applicable):
================================================================
[root at zod ~]# rpm -qa|grep gluster
glusterfs-client-xlators-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-cli-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-libs-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-api-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-fuse-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-debuginfo-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-server-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-3.7.4-0.27.git143f0f9.el7.centos.x86_64
[root at zod ~]# gluster --version
glusterfs 3.7.4 built on Sep  9 2015 01:30:47
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
GlusterFS comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GlusterFS under the terms of the GNU General
Public License.
[root at zod ~]# 



Steps to Reproduce:
==================
1.create a dist-rep volume and mount it on fuse and create some files
2) Now attach a tier with only one brick
3)now issue a detach tier
it is impossible to detach due to following error






[root at zod glusterfs]# gluster v info zx

Volume Name: zx
Type: Tier
Volume ID: f001c58b-82a6-4880-a254-4e3f09a191d3
Status: Started
Number of Bricks: 5
Transport-type: tcp
Hot Tier :
Hot Tier Type : Distribute
Number of Bricks: 1
Brick1: zod:/rhs/brick4/zx
Cold Tier:
Cold Tier Type : Distributed-Replicate
Number of Bricks: 2 x 2 = 4
Brick2: zod:/rhs/brick1/zx
Brick3: yarrow:/rhs/brick1/zx
Brick4: zod:/rhs/brick2/zx
Brick5: yarrow:/rhs/brick2/zx
Options Reconfigured:
performance.readdir-ahead: on
[root at zod glusterfs]# gluster v status zx
Status of volume: zx
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Hot Bricks:
Brick zod:/rhs/brick4/zx                    49180     0          Y       2083 
Cold Bricks:
Brick zod:/rhs/brick1/zx                    49178     0          Y       1968 
Brick yarrow:/rhs/brick1/zx                 49172     0          Y       17259
Brick zod:/rhs/brick2/zx                    49179     0          Y       1986 
Brick yarrow:/rhs/brick2/zx                 49173     0          Y       17279
NFS Server on localhost                     2049      0          Y       2106 
NFS Server on yarrow                        2049      0          Y       17455

Task Status of Volume zx
------------------------------------------------------------------------------
Task                 : Rebalance           
ID                   : 0ffd667b-9810-4b17-80f0-454dd457b39e
Status               : in progress         

[root at zod glusterfs]# gluster  v detach-tier zx status
volume detach-tier status: failed: Detach-tiernot started
[root at zod glusterfs]# gluster  v detach-tier zx start
volume detach-tier start: failed: Bricks not from same subvol for distribute
[root at zod glusterfs]# gluster  v detach-tier zx start
volume detach-tier start: failed: Bricks not from same subvol for distribute
[root at zod glusterfs]# gluster  v detach-tier zx commit
volume detach-tier commit: failed: Bricks not from same subvol for distribute
[root at zod glusterfs]# gluster  v detach-tier zx commit force
volume detach-tier commit force: failed: Bricks not from same subvol for
distribute
[root at zod glusterfs]# 



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